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env/dpdk: remove the fake rte_bus

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This practically reverts commit 2fe7aa5e4 [1].

The extra rte_bus was supposed to allow running SPDK
as a non-priviledged user by enabling RTE_IOVA_VA mode.
DPDK uses RTE_IOVA_PA by default - which means there are
physical addresses used as memseg IOVAs and hence the
root access is required to retrieve those physical
addresses. This patch was supposed to be paired with
a different DPDK patch of mine, but DPDK rejected that
one. Instead, in DPDK 18.11+ the user can force iova mode
by specifying --iova-mode=<mode> command line option,
where <mode> is either pa or va.

Either way, apparently there are cases where physical
address contiguity is required even without UIO (#707)
so let's revert this patch and consistently stick with
RTE_IOVA_PA.

SPDK requires some more effort to support running as
a non-priviledged user anyway.

Fixes #707

[1] env_dpdk/vtophys: register a fake rte_bus supporting RTE_IOVA_VA

Change-Id: I90bf097fd6a7f129444229dc7cf07a462d4f2d09
Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/448121
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
This commit is contained in:
Darek Stojaczyk 2019-03-15 08:06:45 +01:00 committed by Jim Harris
parent ac2dd4b2c2
commit 07042bdeb1
1 changed files with 0 additions and 46 deletions
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46
lib/env_dpdk/memory.c
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@ -1345,49 +1345,3 @@ spdk_vtophys(void *buf, uint64_t *size)
return paddr_2mb + (vaddr & MASK_2MB);
}
}
static int
spdk_bus_scan(void)
{
return 0;
}
static int
spdk_bus_probe(void)
{
return 0;
}
static struct rte_device *
spdk_bus_find_device(const struct rte_device *start,
rte_dev_cmp_t cmp, const void *data)
{
return NULL;
}
#if RTE_VERSION >= RTE_VERSION_NUM(17, 11, 0, 3)
static enum rte_iova_mode
spdk_bus_get_iommu_class(void) {
/* Since we register our PCI drivers after EAL init, we have no chance
* of switching into RTE_IOVA_VA (virtual addresses as iova) iommu
* class. DPDK uses RTE_IOVA_PA by default because for some platforms
* it's the only supported mode, but then SPDK does not support those
* platforms and doesn't mind defaulting to RTE_IOVA_VA. The rte_pci bus
* will force RTE_IOVA_PA if RTE_IOVA_VA simply can not be used
* (i.e. at least one device on the system is bound to uio_pci_generic),
* so we simply return RTE_IOVA_VA here.
*/
return RTE_IOVA_VA;
}
#endif
struct rte_bus spdk_bus = {
.scan = spdk_bus_scan,
.probe = spdk_bus_probe,
.find_device = spdk_bus_find_device,
#if RTE_VERSION >= RTE_VERSION_NUM(17, 11, 0, 3)
.get_iommu_class = spdk_bus_get_iommu_class,
#endif
};
RTE_REGISTER_BUS(spdk, spdk_bus);